Things to Do in São Tomé and Príncipe in December
December weather, activities, events & insider tips
December Weather in São Tomé and Príncipe
Is December Right for You?
Advantages
- Gravana season brings calmer seas on the leeward coast - water visibility improves to 15-20 m (50-65 ft) making this genuinely the best month for snorkeling and diving around Ilhéu das Rolas and the southern coastlines
- Sea turtle nesting season peaks in December - you'll find olive ridley and green turtles laying eggs on beaches like Praia Jalé and Praia Piscina, with guided night walks offering 70-80% success rates for sightings
- Cocoa harvest is in full swing - the roças (plantation estates) are actually working, not just museum pieces, and you can see the entire fermentation process happening in real time at places like Roça São João dos Angolares
- December sits right between the two rainy seasons - you get the lush green landscapes from earlier rains but increasingly stable weather as the month progresses, with morning hours typically clear until 2-3pm
Considerations
- Humidity hovers around 70% and feels higher in the forest interior - your clothes won't fully dry overnight, electronics need silica packets, and that 29°C (84°F) feels more like 33°C (91°F) when you're hiking to waterfalls
- International flights fill up early for December - TAP Portugal from Lisbon and the STP Airways connections get booked 2-3 months ahead, and you're looking at €800-1,200 range even when booked early, with limited flexibility if you wait
- Afternoon rain showers are unpredictable - they might last 20 minutes or three hours, and while locals just wait them out at a beach bar with a Rosema beer, it can derail tight schedules if you're trying to pack too much into one day
Best Activities in December
Southern coastal snorkeling and diving expeditions
December's calmer gravana conditions make the southern waters around Ilhéu das Rolas exceptionally clear - visibility reaches 15-20 m (50-65 ft) compared to 8-10 m (26-33 ft) during rainy months. The water temperature sits at a comfortable 27°C (81°F), and you're likely to spot humpback whales migrating through these waters. Morning departures work best before afternoon weather builds.
Roça plantation cocoa harvest tours
December is peak cocoa harvest season - you'll see workers opening pods, fermenting beans in wooden boxes, and drying cocoa on massive raised platforms. The working roças like São João dos Angolares and Monte Café actually smell like chocolate during fermentation. Morning tours (starting 7-8am) let you see the harvest in action before it gets too hot, and the colonial architecture photographs beautifully in December's dramatic cloud cover.
Sea turtle nesting night walks
December is prime nesting season for olive ridley and green turtles on the southern beaches. Guided night walks at Praia Jalé and Praia Piscina between 8pm-midnight offer 70-80% success rates for witnessing nesting - you'll watch females dig nests and lay 80-120 eggs over 45-60 minutes. The experience is tightly regulated to protect the turtles, with red-light flashlights only and mandatory 10 m (33 ft) distance until the turtle is committed to laying.
Obo National Park rainforest trekking
December's recent rains keep the forest intensely green and waterfalls flowing strong, though trails can be muddy - you'll need proper boots. The morning hours (6-11am) offer the best conditions before afternoon showers roll in. Cascata São Nicolau, a 15 m (49 ft) waterfall with a swimming hole, makes a solid half-day objective at 3-4 hours round trip. Birdwatchers should note that December is peak season for endemic species like the São Tomé fiscal and giant sunbird.
São Tomé Town market and street food exploration
Mercado Municipal comes alive early morning (6-9am) with December's bounty - fresh cocoa pods, breadfruit, jackfruit the size of your torso, and the day's fish catch. The covered market stays active through afternoon rain showers, making it a reliable indoor option. Street vendors around the market sell calulu (smoked fish stew) and banana pão (sweet fried bread) for 30,000-50,000 dobras (€1.20-2 USD). Saturday mornings are particularly vibrant with vendors from surrounding villages.
Príncipe Island extension for serious nature immersion
If you've got the budget and time, December offers excellent conditions for the 35-minute flight to Príncipe - the smaller, wilder sister island with just 8,000 residents. The UNESCO Biosphere Reserve forests are at peak lushness, and Banana Beach regularly appears on those 'world's best beaches' lists for good reason. The island feels like São Tomé did 30 years ago. Plan minimum 3-4 days to justify the trip cost.
December Events & Festivals
Independence Day (December 21)
São Tomé and Príncipe celebrates independence from Portugal with parades, traditional dance performances, and speeches in São Tomé Town. The waterfront along Avenida Marginal 12 de Julho becomes the focal point with music stages and food vendors. It's not a massive tourist spectacle but offers genuine insight into national pride - locals dress up, flags appear everywhere, and the energy is genuinely celebratory rather than performative. Banks and government offices close.
Christmas celebrations
Christmas here blends Portuguese Catholic traditions with local culture - expect midnight mass at the cathedral in São Tomé Town on December 24, followed by family gatherings that extend into Christmas Day. Many restaurants and tour operators close December 24-26 for family time. The holiday feels more religious and family-focused than commercial. If you're here during Christmas, you'll likely be invited to join local celebrations - Santomeans are remarkably hospitable.